99 Taurus SHO Overdrive issue - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
Ford Forum Ford Forum

» Auto Insurance
» Featured Product
ยป Wheel & Tire Center

Go Back   Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > Ford Cars and PAG Vehicles > Ford Taurus | Mercury Sable | Ford Taurus SHO | 1986-2007
Register Home Forum Active Topics Photo Gallery Auto Loans Garage Mark Forums Read Auto Escrow

Ford Taurus | Mercury Sable | Ford Taurus SHO | 1986-2007 Forum for discussion of the Ford Taurus, Mercury Sable and Ford Taurus SHO. Covers vehicle years: 1986-2007

FordForums.com is the premier Ford Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 08-15-2012, 11:18   #1 (permalink)
Registered User
 
Join Date: Aug 2012
Location: Seekonk, MA
Posts: 1
99 Taurus SHO Overdrive issue

Been driving this one since it was 1 year old and still has relatively low mileage - approx. 77K. Just recently started having a problem with regard to the overdrive function. I can be driving along and suddenly the Overdrive Off light comes on, the speedometer behaves erratically, and the RPMs seem, not 100% sure on this, run high. The only way to "reset" the situation is to stop the car and turn off the ignition. Once I turn it back on, and it can be immediately, it is normal, for a bit. My regular drive to work is about 7 miles each way, and it seems to handle that okay. Today I had to go to a meeting out of town and after, approx., 15 to 20 miles, it started acting up again. So, I'm guessing, its possible it might be something temperature related. Unfortunately, definitely thinking transmission (hope not). I did check the tranny fluid (about the extent of my automotive expertise), and it was at the appropriate level and looked clean. Any thoughts will be appreciated (before I end up at my dealers' service dept).
bafurman is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 08-15-2012, 18:04   #2 (permalink)
Dazed and Confused
 
CatSkinner's Avatar
 
Join Date: May 2012
Location: Upstate New York
Posts: 3,539
Re: 99 Taurus SHO Overdrive issue

Check vacuum line, plugs, and seals and see if there's ant diagnostics. AutoZone or Advanced Auto can probably loan you a scan tool.
CatSkinner is online now   Reply With Quote
Old 08-20-2012, 09:15   #3 (permalink)
canuck
 
360ci's Avatar
 
Join Date: Nov 2007
Location: Waterloo
Posts: 2,475
Re: 99 Taurus SHO Overdrive issue

If the transmission light is on, codes will be stored for up to 50 restarts.

I believe there is an OD solenoid within the transmission that might be faulty. It might also be a couple other things. A bad IAC (idle air controller) can cause havoc on the transmission, along with a throttle position sensor. A bad TPS is often misdiagnosed as a major transmission problem. The IAC can be cleaned. The TPS cannot.

The other problem might be with the A/F ratio. The MAF sensor will get dirty eventually and start throwing the PCM incorrect readings that can result in anything from engine misfire to rpm fluctuations as you mentioned. In most cases the MAF can be cleaned with yes, you guessed it - MAF cleaner, thus saving yourself a couple hundred dollars.

Of course, worst case is that there are multiple problems, or the one problem led to another as more than one sensor has failed. The utmost worst outside of a transmission, is a bad PCM or wiring harness issue that will put the cost in the hundreds of dollars.

Most transmission sensors require dropping the pan, at which time a transmission service is required (about $100 or so). In some cases, a service isn't necessary but if it's been 40K miles since the last service, you're due.
__________________
'00 Durango R/T 360ci 290hp (modded); 138,500m
'06 Pontiac G6 GT 3.5L 220hp; 44,000m
'12 Chrysler 200 Limited 3.6L 283hp; 13,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!
360ci is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply

  Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > Ford Cars and PAG Vehicles > Ford Taurus | Mercury Sable | Ford Taurus SHO | 1986-2007



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Powered by vBadvanced CMPS v3.2.2

All times are GMT -7. The time now is 18:48.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.6.0
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.